from urllib.parse import urljoin
from bs4 import BeautifulSoup
import re

__author__ = 'hexun'


class HtmlParser(object):
    def parse(self, page_url, html_cont):
        if page_url is None or html_cont is None:
            return
        soup = BeautifulSoup(html_cont, 'html.parser')
        new_urls = self._get_new_urls(page_url, soup)
        new_data = self._get_new_data(page_url, soup)
        return new_urls, new_data

    def _get_new_urls(self, page_url, soup):
        links = soup.find_all('a', href=re.compile(r"/item/*"))
        urls = set()
        for link in links:
            new_url = link['href']
            new_full_url = urljoin(page_url, new_url)
            urls.add(new_full_url)
        return urls

    def _get_new_data(self, page_url, soup):
        res_data = {}
        res_data['url'] = page_url
        title_node = soup.find("dd", class_="lemmaWgt-lemmaTitle-title").find("h1")
        res_data['title'] = title_node.get_text()
        # <div class="lemma-summary" label-module="lemmaSummary">
        summary_node = soup.find("div", class_="lemma-summary")
        res_data['summary'] = summary_node.get_text()

        return res_data

    